生成驗證碼工具類
package com.neusiri.util;
/**
* @author zdj
* @create 2018/12/19/019 18:18
* @desc 驗證碼
**/
import sun.misc.BASE64Encoder;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.Random;
public class ImageUtil {
// 驗證碼字符集
private static final char[] chars = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N',
'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'};
// 字符數量
private static final int SIZE = 4;
// 干擾線數量
private static final int LINES = 5;
// 寬度
private static final int WIDTH = 80;
// 高度
private static final int HEIGHT = 30;
// 字體大小
private static final int FONT_SIZE = 30;
/**
* 生成隨機驗證碼及圖片
* Object[0]:驗證碼字符串;
* Object[1]:驗證碼圖片。
*/
public static Object[] createImage() {
StringBuffer sb = new StringBuffer();
// 1.創建空白圖片
BufferedImage image = new BufferedImage(
WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
// 2.獲取圖片畫筆
Graphics graphic = image.getGraphics();
// 3.設置畫筆顏色
graphic.setColor(Color.LIGHT_GRAY);
// 4.繪製矩形背景
graphic.fillRect(0, 0, WIDTH, HEIGHT);
// 5.畫隨機字符
Random ran = new Random();
for (int i = 0; i <SIZE; i++) {
// 取隨機字符索引
int n = ran.nextInt(chars.length);
// 設置隨機顏色
graphic.setColor(getRandomColor());
// 設置字體大小
graphic.setFont(new Font(
null, Font.BOLD + Font.ITALIC, FONT_SIZE));
// 畫字符
graphic.drawString(
chars[n] + "", i * WIDTH / SIZE, HEIGHT*2/3);
// 記錄字符
sb.append(chars[n]);
}
// 6.畫干擾線
for (int i = 0; i < LINES; i++) {
// 設置隨機顏色
graphic.setColor(getRandomColor());
// 隨機畫線
graphic.drawLine(ran.nextInt(WIDTH), ran.nextInt(HEIGHT),
ran.nextInt(WIDTH), ran.nextInt(HEIGHT));
}
// 7.返回驗證碼和圖片
return new Object[]{sb.toString(), image};
}
/**
* 隨機取色
*/
public static Color getRandomColor() {
Random ran = new Random();
Color color = new Color(ran.nextInt(256),
ran.nextInt(256), ran.nextInt(256));
return color;
}
public static void main(String[] args) throws IOException {
Object[] objs = createImage();
BufferedImage image = (BufferedImage) objs[1];
OutputStream os = new FileOutputStream("D:/1.png");
ImageIO.write(image, "png", os);
os.close();
}
}
驗證碼接口Controller
package com.neusiri.epcstest.login.controller;
import com.neusiri.util.ImageUtil;
import com.neusiri.util.JsonRESTResult;
import com.neusiri.util.JsonRESTResultMsg;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import sun.misc.BASE64Encoder;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.util.HashMap;
import java.util.Map;
@RestController
public class ValidateCodeController {
/**
* @author zdj
* @create 2018/12/19/019 18:23
* @desc 利用驗證碼工具生成驗證碼
**/
/* @RequestMapping(value = "/validateCode")
public JsonRESTResult validate(HttpSession session, HttpServletRequest request,
HttpServletResponse response)throws Exception{
JsonRESTResult jsonRESTResult = new JsonRESTResult();
//利用圖片工具生成圖片
//第一個參數是生成的驗證碼,第二個參數是生成的圖片
Object[] objs = ImageUtil.createImage();
//將驗證碼存入Session
session.setAttribute("imageCode",objs[0]);
System.out.println("驗證碼:"+session.getAttribute("imageCode"));
//將圖片輸出給瀏覽器
BufferedImage image = (BufferedImage) objs[1];
response.setContentType("image/png");
OutputStream os = response.getOutputStream();
ImageIO.write(image, "png", os);
jsonRESTResult.setCode(JsonRESTResultMsg.CODE_800.getCode());
jsonRESTResult.setMsg("生成驗證碼成功");
jsonRESTResult.setData(objs[0]);
return jsonRESTResult;
} */
@RequestMapping(value = "/validateCode")
public JsonRESTResult validate(HttpSession session, HttpServletRequest request,
HttpServletResponse response)throws Exception{
JsonRESTResult jsonRESTResult = new JsonRESTResult();
//利用圖片工具生成圖片
//第一個參數是生成的驗證碼,第二個參數是生成的圖片
Object[] objs = ImageUtil.createImage();
//將驗證碼存入Session
session.setAttribute("imageCode",objs[0]);
// System.out.println("驗證碼:"+session.getAttribute("imageCode"));
//將圖片轉正base64
BufferedImage image = (BufferedImage) objs[1];
//轉base64
BASE64Encoder encoder = new BASE64Encoder();
ByteArrayOutputStream baos = new ByteArrayOutputStream();//io流
ImageIO.write(image, "png", baos);//寫入流中
byte[] bytes = baos.toByteArray();//轉換成字節
String png_base64 = encoder.encodeBuffer(bytes).trim();//轉換成base64串
//刪除 \r\n
png_base64 = png_base64.replaceAll("\n", "").replaceAll("\r", "");
Map map = new HashMap<>();
map.put("base64","data:image/png;base64,"+ png_base64);
map.put("validateCode",objs[0]);
jsonRESTResult.setCode(JsonRESTResultMsg.CODE_800.getCode());
jsonRESTResult.setMsg("生成驗證碼成功");
jsonRESTResult.setData(map);
return jsonRESTResult;
}
}
注:轉換成base64串時,一定要刪除\r和\n
線上測試工具:圖片和base64串項目轉換http://imgbase64.duoshitong.com/